CaCl2
raport atomic=r.a.=1Ca:2Cl=1:2
raport de masa=r.m.=ACa:2ACl=40:2.35,5=40:71
Masa moleculara=M= 40+71=111
Comp.proc.
111g CacL2----------40g Ca-------------71g Cl
100g -------------------x------------------------y
x=100.40:111=36,03 la suta Ca
y=100.71:111=63,96 la suta Cl
M CaCl2=40+71=111
111g CaCl2--------40 g Ca
38 g CaCl2--------xg Ca
x=38.40:111=13,69 gCa
